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' W. H. MARSH.

HYDRAULIC ELEVATOR.

No. 383,232. Patented May 22, 1888.

WITNESSES: x INVENTOH, M\(% 7 WA r4. BY I ATTORNEY.

N PETERS. Pmwuum m hm, Washmg'lnn, 91C- tries.

ILLIAM H. MARSH, OF NEW YORK, N. Y.

HYDRAULIC ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 383,232, dated May 22,1888.

Application filed July 2, 1887. Serial No. 243,213. (X0 model.)

To aZZ whom it may concern.-

Be it known that-1, WILLIAM H. Mansn, of the city, county, and State ofNew York, acitizen of the United States, have invented certain new anduseful Improvements in Hydraulic Elevators, of which the following is afull, clear, and exact description, reference be ing had to theaccompanying drawings, forming part of this specification.

My invention relates to hydraulic elevators, and more particularly tothose in which the water pressure is established by means of steamadmitted to the water-reservoir above the water therein; and myinvention consists in the devices hereinafter particularly described,and as more at length recited in the claims.

Figure 1 is a side elevation, partly in section, of a hydraulic-elevatormotor containing the principal features of my invention. Fig. 2 is aplan section on the line mm, Fig. 1, and showing the water-reservoirwall and the float device. Fig. 3 is a detached view in vertical sectionof the valves I employ in connection with the watercylinder, thereservoir, and the steam'supply.

A is the watercylinder, B the piston, and B the piston-rod.

O is the water-reservoir.

The cylinder and reservoir are preferably arranged vertically, as shown.At 0' is shown a pipe by which steam is admitted to the reservoir G, thepipe being provided with a valve, 0 (hereinafter more particularlydescribed,) and with this valve is connected an exhaustpipe, 0, for thesteam, At 0 is a pipe leading from the lower end of the water-cylinderto the lower end of the reservoir, and this pipe is provided with avalve, 0. The steam-supply pipe c leads into the upper end of thereservoir.

The valves 0 and c are constructed as threeway valves, and I find itpreferable to so arrange the corresponding ports in the respectivevalves that the steam will be admitted to or allowed to exhaust throughthe valve 0 from the reservoir 0 a little before the flow of the waterfrom the reservoir to the cylinder A, or the reverse, respectively, isestablished through the valve 0''. To accomplish this, the ports in thevalve 0 which communicate with the exhaust and the steam supply,respectively, as shown at c and c, Fig. 8, are formed or placed nearerto the line of the port 0 in said valve communicating with the pipe tothe reservoir than the ports in the valve 0 which lead thereout to thereservoir, as shown at a c, are to the line of the port 0, communicatingfrom said valve to the water-cylinder, and the valve-plunger in thesteam-valve c is made somewhat longer than the valveplunger in the valve0.

The twoplungers c and c are connected together by a rod, 0', so that theplungers have concurrent motion in their respective valvechambcrs. Nowwhen theplungers are moved upward together to establish communicationbetween the steam-supply and the upper end of the reservoir G, throughthe ports c and c in valve 0, and to establish communication between thereservoir and the water-cylinder A, through the ports a and 0 of valvec,theports c and 0 will be uncovered, either partially or entirely, asmay be desired, before the ports 0 and c are uncovered. By this meansthe pressure of the steam in the reservoir 0 on the water therein willbe established more orless completely before the water begins to passfrom the reservoir to the cylinder, and in like manner when the plungersare concurrently moved downward the ports 0 and c in valve 0 are openedand the exhaust established before the ports 0" and c are opened invalve 0, and the return of the water to the reservoir fromthe cylinderbegins. By means of these valve devices so operating, the entrance andexhaust of the steam in the reservoir are prevented from causing anysudden and violent flow of the water from the cylinder to the reservoir, or vice versa, and consequent irregular or sudden movement ofthe piston. This described feature of my invention is, it is evident,applicable to all hydraulic motors comprising a water-reservoir inwhich. steam is used to cause a pressure, a cylinder connected to saidreservoir, and a piston and piston-rod in said cylinder.

D is a shaft mounted to revolve in suitable bearings, (1,011 thenppereylinder-head and at right angles to the axial line of the pistonrod B. This shaft is provided with drums d, or is so formed as to adaptit to have a chain or cable wound upon it.

At 1) D are shown chains or cables, which ICO .are of a lengthsubstantially equal to the length of the stroke of the piston B, andthese chains or cables are attached at one end to the top of thepiston-rod by. a yoke, 0?, carried thereby, and their opposite ends aresecured to the shaft D, one on each side of the pistonrod. Upon theshaft Dare keyed the pulleys D adapted to have wound upon them thehoist-ropes D, one on each, the ends of said ropes being secured to saidpulleys respectively. The hoist-ropes D have their other ends attachedto the car or other weight to be elevated. (Not shown.)

It is evident that when thepiston is carried upward in the cylinder Athe upward thrust of the piston-rod will unwind the cables D from theshaft, thus rotating the shaft, and that the hoist-ropes D which arewound in the reverse direction on the pulleys D", will by the rotationof the shaft be wound upon the pulleys, and that such movement of thehoistropes may be made to serve to elevate a car or weight, and when thepiston is free to descend in the cylinder, by the return of the water tothe reservoir, it is evident that the descending car or weight willoperate to uncoil the hoist-ropes from the pulleys D and so cause theshaft to be reversely rotated, and that the chains D will be coiled uponthe shaft D as the piston-rod descends. The described movements of theparts will be alternate as the elevator is operated to raise or lowerthe car or weight on the hoist-ropes.

By means of the construction and arrange ment described the cylinder Amay be placed upright or vertical, as shown, and carry all the operativeparts of the hoist apparatus on its upper head, thus giving an economyof floor-space in setting up the apparatus for use; and, furthermore, bythe described construction the strain upon all the parts is equalized,the chains or cables D operating on both sides of the piston-rod, asshown, and the two pulleys D on the shaft D dividing the strain of thehoist-ropes on said shaft. The piston-rod is also, by means of the yokecl upon its upper free end, best adapted in its upwardthrust to give thebest application of its power to the hoisting-gear and with the leastliability of displacement or fracture of any of the parts.

E is a float cylindrical in form and fitting loosely within thereservoir, and has the cylindrical body shown and the exteriorly-convexheads 6. The float will rest on the surface of the water in thereservoir. When steam is admitted to the reservoirin the space above thefloat, the pressure will submerge the float to no greater extent at anytime than to bring the rim of its upper head to the waterlevel, theconvexity of the head projecting above the water-level and precludingthe overflow of the water above said head, as would be liable to occurif said head were fiat. In this position it will move in the reservoirwith the water, and will be constantly interposed between the water andthe steam, thus preventing the steam from heating and causingevaporation of thetwater.

The valves 0 and 0 shown are slide-valves; but it is evident that therelative arrangement of parts and the operation described may beeffected in rotary valves constructed according to this describedfeature of my invention.

What I claim as myinvention, and desire to secure by Letters Patent, is-

In a hydraulic motor, thecombination,with the water-cylinder and itspiston and the water-reservoir, of a steam supply pipe leading to saidreservoir and a water-pipe leading from said reservoir to said cylinder,a three-way valve in the steam-pipe, and a three-way valve in thewater-pipe, the entrance and exhaust ports of the steam-valve beingnearer the line of the port leading to the reservoir and the length ofthe plunger thereof being less than the inlet and outlet ports of thewater-valve are to the port leading to the cylinder, and than the lengthof the plunger thereof, respectively, together with a rod or stem commonto and giving concurrent motion to both valves, as and for the purposeset forth.

WILLIAM H. MARSH.

Witnesses:

A. S. FITCH, (l. W. BENJAMIN.

